Some exclaves had been left untouched by the 1844 Act, but in 1894 county councils were given the power to adjust county boundaries, and most anomalies were removed in the next few years. For example, the Measham area of Derbyshire was transferred to Leicestershire in 1897.

The map shows the counties and the county boroughs. When a county borough expanded into territory of a county that was not the one it came from, maps sometimes showed this as an increase in size of the county the county borough was associated with.

Monmouthshire, not shown on the map, was reckoned for some legal purposes among the English counties for most of this period.

The 1888 Act did not contain a list of administrative counties: it was not until 1933 and the passing of a new Local Government Act that they were enumerated in the Act's schedule. Unlike the 1888 Act, the 1933 Act did not include county boroughs as administrative counties.

In legislation and formal documents the suffix "shire" was generally not used: for example, Bedfordshire was referred to as "the administrative county of Bedford" and the Northamptonshire council as the "county council of Northampton". In the case of Lancashire and Cheshire the councils were officially the "county council of the palatine county". Shropshire was always officially entitled the "county of Salop". The right of Berkshire to be described as a "royal county" was recognised by the monarch in 1958. On 1 April 1959 the administrative county of Southampton was renamed as Hampshire.

This system was the basis of the ceremonial counties used for Lieutenancy – except that Cambridgeshire, Hampshire, Lincolnshire, Northamptonshire, Suffolk and Sussex were not split for Lieutenancy. (Yorkshire, however, was).

The table lists the area and population of each administrative county at the censuses of 1891 and 1961.[2][3]

Several county councils had administrative headquarters outside of their area. This was usually because the traditional county town was a county borough. The headquarters of Derbyshire, Leicestershire and Nottinghamshire county councils were moved from the county boroughs to locations within their respective administrative counties.

^(5) Moot Hall Precincts were an exclave of the administrative county within the county borough of Newcastle upon tyne

^(6) The decision to move the county council headquarters was made on 15 April 1890, and the new county hall opened 14 November 1893.[4] Kingston was removed from the administrative county of Surrey in 1965, becoming part of the Royal Borough of Kingston upon Thames in Greater London

The boundaries of the administrative counties changed considerably over time. The reasons for this were threefold: the growth of towns on either side of an existing boundary, the creation and extension of county boroughs and the elimination of outlying exclaves and other anomalies.

As urbanisation increased, and suburbs were built on a scale not seen before, the urban areas surrounding various towns and cities started to cross traditional county borders. The Local Government Act 1888 provided that in the case that an urban sanitary district crossed a county border, the entire district would be considered part of the county in which the larger part was. This condition was maintained with the expansion of urban districts and municipal boroughs.

Additionally, the territory and population of administrative counties was reduced by the increasing numbers of county boroughs, and extensions thereof. This was recognised as a problem, and the process of creation and enlargement of such boroughs was made more difficult by the Local Government (County Boroughs and Adjustments) Act 1926. By June 1970 25% of the population were within the county boroughs.[5]

On creation, many of the administrative counties had a number of exclaves. During the 1890s most of these were eliminated, with parishes being exchanged between counties. The boundaries of Gloucestershire, Worcestershire and Wiltshire contained numerous enclaves and exclaves, and were realigned in 1931.

Throughout the next century, debates took place about what should be done about local government in respect of the increasing urbanisation of the country. Proposals to expand or change county boroughs or to create larger urban counties were discussed, but nothing happened until 1963, when legislation was passed to come into effect in 1965.